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Borers - Flowers

Back to Common Problems - Annuals, Bulbs, Groundcovers, Perennials, and Vines There are several caterpillars that bore into herbaceous plants. The larvae of several clearwing moths bore into the stems or roots of the plants. The larvae are creamy white with a brown head. Adults resemble wasps...

Blister Beetle - Flowers

Back to Common Problems - Annuals, Bulbs, Groundcovers, Perennials and Vines There are 250 species of blister beetles in the U.S. The name blister refers to the chemical cantharidin in their bodies. This chemical will blister the skin if the beetle is crushed against it. The adult beetles are 1/2...

Beetle Grubs/Root Feeding Insects - Flowers

Back to Common Problems - Annuals, Bulbs, Groundcovers, Perennials, and Vines Grubs are the larvae of beetles such as Japanese beetle, Green June beetle, May or June Beetle, Chafers, Oriental beetle and weevils (beetles with snouts), such as black vine weevil. Grubs are generally creamy colored...

Aphids - Flowers

Back to Common Problems - Annuals, Bulbs, Groundcovers, Perennials, and Vines Most aphids are small, soft-bodied insects, of various colors (green, yellow, orange, red, black or white), some may be covered with fluffy white wax. All aphids have long, slender mouthparts, which they use to suck out...

Wilt Diseases - Flowers

When fungi or bacteria enter the roots and stems of a plant and cause stunting, wilt and death by plugging the vascular system, this is called a "vascular wilt." Infected plants wilt and die. If you cut into the stem, the vascular tissues show discoloration as tan, reddish, or dark streaking...

White Mold - Flowers

Back to Common Problems - Annuals, Bulbs, Groundcovers, Perennials, and Vines When a plant or part of the plant (leaf, flower, fruit) rapidly collapses and dies this is called blight. Many bacteria, fungi, and viruses can cause blights. Most blights are favored by certain weather conditions, such...

Viruses - Flowers, Vines

Back to Common Problems - Annuals, Bulbs, Groundcovers, Perennials, and Vines Symptoms of virus infection include necrotic spots, abnormal dark green and light green mosaic and mottling of leaves, growth distortion, stunting, ring patterns or bumps on plant foliage, and abnormal flower coloration...

Rust - Flowers and Vines

Back to Common Problems - Annuals, Bulbs, Groundcovers, Perennials, and Vines Symptoms of infection usually appear as light colored spots on the upper leaf surface followed by rusty colored areas of spores either on the upper or lower leaf surfaces (goldenrod and geranium). Rubbing these areas with...

Root, Crown and Stem Rots - Flowers

Back to Common Problems - Annuals, Bulbs, Groundcovers, Perennials and Vines Root and crown infections will first appear as wilting or collapse of the plant. Early detection of infected plants includes scouting for plants that either wilt or collapse during periods of water stress. Chronically...

Voles - Groundcovers

Voles, also known as meadow mice, are very plentiful in many landscapes. They are often confused with a mole. However, unlike the mole, they feed on plant material and spend more time above ground. There are actually two species in Maryland: the meadow vole and the pine vole. Voles are active day...

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